城市生活垃圾持水曲线的试验研究

Experimental study on soil water characteristic curve of municipal solid waste

摘要: 城市生活垃圾的持水曲线是垃圾填埋场水气运移分析的重要参数。本文介绍了采用Tempe仪和压力板仪测试杭州城市生活垃圾持水曲线的方法与结果;通过对比试验,研究了垃圾的组份和孔隙比对垃圾持水曲线的影响。通过对试验结果的分析,获得垃圾持水曲线的特征指标。结果表明:垃圾的进气值ψa接近0 kPa,残余体积含水量θr为25%～35%,对应的基质吸力ψr为10～40 kPa;垃圾田间持水量为31%～46.5%,对应的质量含水率w为52%～130%,与现场垃圾含水率的测试结果比较一致。

Abstract: The soil water characteristic curve（SWCC） of municipal solid waste（MSW） is an important parameter for the flow analysis of gas and water in landfill.The SWCC of MSW from Hangzhou was measured by the use of Tempe cell and pressure plate.The influences of composition and void ratio on SWCC were investigated.It was shown that the air-entry value of the MSW was close to 0 kPa,the residual water content was 25%³5%,and the corresponding suction was between 10⁴0 kPa,depending on composition and void ratio.The field capacity of the MSW fell into the range between 31% and 46.5%,and the corresponding gravity water content was 52%¹30%,which was consistent with the range of in-situ water content measured at Tianziling Landfill.